According to cognitive averaging theory, preferences for attractive faces result from their similarity to facial prototypes, the categorical central tendencies of a population of faces. Prototypical faces are processed more fluently, resulting in increased positive affect in the viewer.

中文翻译：

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吸引力偏差：认知解释

根据认知平均理论，对有吸引力的面孔的偏好源于它们与面部原型的相似性，即一组面孔的分类中心趋势。原型面孔的处理更加流畅，从而增加了观看者的积极影响。